This time when I put the BMW MAF on the flow bench I tested the part in several configurations.
MAF with both grills in place
MAF with large space grill removed
MAF with small space grill removed
MAF with both grills removed
MAF with both grills removed and K&N filter attached
BMW MAF HousingBMW MAF Housing
The results are shown below:
BMW MAF and K&N Air Filter
For the most part the results were as expected. As the grills were removed from the MAF housing the airflow increased. The removal of the small grill led to a greater increase in airflow than the removal of the large space grill.
What was a surprise was the increase in airflow that occurred when the grill-less MAF housing had the K&N cone air filter attached. This is most likely attributable to the filter neck smoothing the airflow as it enters the MAF housing. I’m impressed by the fact that adding the air filter increased airflow, that was not the case with the stock airbox when I tested it using the EPL MAF housing.
Today I removed the Nogaro’s engine so I could get a better assessment of what I have sitting in my garage. One thing that was apparent during the removal process is that the car shows the result of making some poor decisions. I’ve not come across anything that is horribly wrong with the car, in fact the more I work on it the more upbeat I’m becoming that this can be a decent car. What I have been shaking my head about is the potpourri of nuts and bolts that have found their way onto this car in places I would not expect.
I suppose I have been spoiled by the fact that I’ve been the only person working on my S4, and I’ve made an effort to keep the original nuts and bolts, or at least to minimize the reliance on bolts that I find laying around.
MIscellaneous Bolts
See above to understand what I’m talking about. Really?
Three different type bolts / nuts are used to attach the downpipe to turbocharger – there are only four used in all, it’s almost something you have to be trying to do to use three different ones.
Two different bolts holding the turbo to the exhaust manifold.
Missing bolt from transmission housing. (See below for my tip on how to avoid reattaching your transmission and failing to fully bolt it up.
Did not completely seat the sensor housing, o-ring is exposed.
Non-standard O2 sensor. Just buy the real thing, that way I’m not having to deal with B1 S1 / B2 S1 Oxygen Sensor DTC’s.
Here’s what I suggest you do if you are swapping clutches or flywheels, or transmissions:
Santorin Transmission Swap
And use them, all of them.
Here’s some more silliness that I came across.
What?
WTF is going on there? Was someone going for an Abstract artistic look on the back of the cylinder head? I started scraping the stuff off because I could find no reason for it being there.
Turbo Bolt
Here (above) someone got lazy and decided not to finish bolting the turbo to the exhaust manifold.
Plus Size Crush Washer
Why bother waiting for the correct size crush washers to be delivered, go with what you’ve got on hand. Or maybe these were the crush washers that came with the turbo’s! They’re not leaking, so no point in changing them out at this time.
Speaking of the tubochargers – I have no idea what ‘brand’ these are.
Mystery K04
It says K04 on the ID tag, but that is clearly not a BorgWarner K04. On the positive side, there is no apparent signs of damage to the blades, the blades turn freely, and there is not unusual play in the center section. I’ll likely continue with them and see how they work out.
Oil sensor
The oil warning annunciator has been on, this may explain why. It would help to connect the sensor to the car via the engine harness wire, if one of the previous owners did not cut the wire and discard the connector.
So here is where the engine sits now:
Nogaro Engine
I’m getting a better feel for what needs to be done, which is surprisingly little, mainly finding the correct nuts and bolts to attach some of these parts, and probably also install a proper set of O2 sensors.
One of the positive surprises that I have come across is this short shifter. I don’t know what make it is, but it’s an aftermarket shifter setup for sure.
The car also has some very nice wheels on it, OZ X-Line Power in the 18″ size. They complement the Nogaro color nicely. Presently they have Bridgesone Blizzak LM-60 Winter Tires on them, so the car came with a very nice wheel setup. They’re not my thing though, I’m into the 17″ wheels, so these will be going away.
OZ X-Line Power Wheel
I’m also thinking there’s an extra 25-30 whp tucked up under the hood, resident in these stickers.
As I begin to assess this Nogaro S4 there are a number of positive aspects of the car. First, and foremost, is the efforts to build it into a Stage 3 car have resulted in quite a few upgrade modifications having been performed. Thus far I am aware of the following components having been replaced.
Part (Cost)
[No Name] Turbochargers ($600?)
Clutchmasters FX400 6 puck clutch ($800)
Fidanza lightweight flywheel ($420)
Bosch EV14 550 fuel injectors ($250)
K&N Cone Intake ($187)
Walbro 450 Fuel Pump ($157)
H&R Coilovers ($950)
Stabila Front Sway Bar ($229)
Borla 3″ Single Exhaust ($758)
034 front billet aluminum subframe bushings ($150)
I’d like to positively determine if the car has BorgWarner K04’s so I am in the process of pulling out the engine and transmission.
Prepping for engine pullIn position
I’m almost there, I have a message into the prior owner to find out how the shift knob is removed! Once I get that off I’ll be able to drop the shifter and be ready to attach the engine hoist.
The Odd:
Some peculiar things I’ve come across while preparing to remove the engine. Lots of different bolts being used. Lots of vacuum lines disconnected. Wood screws being used to hold the bumper in place, yes that’s right, wood screws!
Driver sidePassenger side
The driver’s side screw was easy to undo, the passenger side was a different matter. The screw head was behind a plastic part, completely inaccessible. I had to use a pair of pliers to back the screw out from the pointy end. Bizarre.
Some previous owner chose to go with a single piece exhaust, having a Borla exhaust welded onto the mid pipes.
Borla one piece
Really? Because taking this thing off as a single piece is odd, and I can imagine putting it back on will be fun. I’m thinking of taking a sawz-all to the pipe and finding a band clamp to hold the two pieces together.